Electric-motor-control system.



W. COOPER.

ELEGTBIO MOTOR CONTROL SYSTEM.

APPLICATION FILED APB. 10,1905

912,995. Patented Feb. 23, 1909.

INVENTOR WITNESSES:

Mam

v UNITED STATES PATENT OFFICE.

WILLIAM COOPER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TU WESTINGHOUSE[CRED- TRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRIC-MOTOR-CONTROL SYSTEM.

Specification of Letters Patent.

Application filed April 10, 1906.

Patented Feb. 23, 1909.

Serial No. 254,771.

To all whom it may concern:

Be it known that I, lViLLiAM Coorna, a citizen of the United States, anda resident of lVilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Electric-Motor-Control Systems, of which the following is a specification.

My invention relates to systems of electric motor control and hasspecial reference to systems that are adapted for railway service. Theobject of my invention is to provide, in an auxiliary control system,means for cutting out any one motor of an equipment without interferingwith the control of the 'remaining motors.

In the prior art, when auxiliary control systems were applied to asingle car, or for multiple operation of a train, the whole car becameinoperative if a single motor was rendered unserviceable for any reason,unless a system of switches was provided to modify the connections ofthe main motor circuits so that any one motor could be out out. However,when a motor was cut out in this way, the operation, by the auxiliarycontrol system, of the remaining motor or motors of the equipment wasusually unsatisfactory. By the use of my invention, the auxiliarycontrol system is modified by a selective switch that may occupy any oneof a plurality of predetermined positions to operate a part or the wholeof the equipment in a proper manner by the normal action of the mastercontroller.

The single figure of the accompanying drawing discloses a diagrammaticview of a system embodying my invention and comprising a two-motorequipment arranged for series and multiple operation.

Although a single arrangement is shown and described, 'I desire that myinvention shall not be confined or restricted to any s ccificarrangement, for it may and prob a ly will be applied to a two. or afourmotor equipment arranged for series and multiple operation in eitherdirection, and may embody either automatic acceleration or hand-operatedmaster switch control, as shown.

Referring to the drawing, electrical energy is supplied from a lineconductor 1 to a plurality of motors 2 and 3, which are controlled by anauxiliary system supplied with direct current energy from a battery 4,

' the resistances 26,

ductor 14.

and comprising a motor-selective switch n and a master controller 6. Themaster controller 6 may be operated through a series of positions a, b,c, d, e, f, g, 71., i and j, and the selective switch 5 may occupy anyone of positions w, ar, y and 2, which respectively determine whetherneither motor, both motors, only the motor 3 or only the motor 2 are inuse. When the switch 5 occupies position 00 and the controller 6 ismoved to position a, energy from the battery 4 is supplied through aconductor 7, contact finger 8 and ring segment 9 to a lurality ofcontact fingers 10, 11 and 12. T e finger 10 is connected, throughmagnet coil 13, to the battery line conductor 14 and the coil isenergized to operate a switch 15. The contact finger 11 is connectedthrough contact finger 16 of the selective switch 5, ring segment 17,contact finger 18 and a magnet coil 19, to the conductor 14, the winding19 being thus energized to oplerate a switch 20. The finger 1 2isconnectec through finger 21, ring segment 22, finger 23, and magnetwinding 24, to the conductor 14;, the magnet winding bein thus energizedto close a switch 25.

Vhen the controller 6 occupies position a, main line connections arecompleted from the conductor 1 through the switch 15, a resistance 26,the switch 20, the motor 2, the two resistance portions 27 and 28, theswitch 25, two other resistance portions 29 and 30, and the motor 3, toa corresponding main line terminal 31. Thus the two motors of theequipment are connected in series, with 27, 28, 29 and 30 in circuit.lVhen the master controller 6 is moved to the position b, a contactfinger 32 engages the ring segment 9, from which it is supplied withenergy from the battery 4 and. energizes the magnet winding 33, whichcloses a switch 34. and thereby short-circuits the resistance 26, sincethe finger 32 is connected directly through the winding 33 to thenegative con- As the controller 6 is moved successively to the positions0, d, c and f, the resistance portions 28, 29, 27 and 30 arerespectively short-circuited by the switches 5H). 37 and 38, which arerespectively actuated by windings 39, 40, 41 and 42. The winding- 39,40, 4] and 42 are supplied with energy through the-contact fingers43,44, 45 and 46, which are successively engaged by ring segment 9 andare thus supplied with energy from the battery 1 and are finallyconnected to the negative conductor 14. When the controller 6 occupiesthe position f, the motors 2 and 3 are still connected in series, butall the resistance is cut out of the circuit. As the controller 6 movesto the position g, the

fingers 12, 43, 44, 45 and 46 become disengaged from the ring segment 9,while a nger 47 moves into engagement therewith and supplies energythrough a finger 48 of the selective switch 5, ring segment 49 andfinger 50, to a magnet winding 51, the opposite terminal of which isconnected to the negative conductor 14. The magnet winding 51, whenenergized, closes a switch 52, which connects a single conductor fromone ter minal of the motor 2 to one terminal of the motor 3 andconsequently short-circuits the resistance portions 27, 28, 29 and andthe switch 25. The disengagement of the fingers 43, 44, 45 and 46de-magnetizes the windings 39, 40, 41 and 42 and causes the solenoidswitches 35, 36, 37 and 38 to open, and the disengagement of the finger12 deenergizes the winding 24 and allows the switch 25 to open. As thecontroller 6 approaches the position IL, energy is supplied from ringseg 1 again energizes the win ment 9, throu h rin segment 53, to fingers54 and 55. he nger 54 is connected, through the finger 56 of the switch5, segment 57 and finger 58, to a magnet winding 59, the oppositeterminal of which is connected to the negative line conductor 14. Thewinding 59, when energized, closes the switch 60 and the winding 61, oneterminal of which is connected directly to the finger 55 and the otherterminal to the negative battery conductor 14, when energized, closes aswitch 62. As the controller 6 moves positively into the position it,the finger 47 becomes disengaged from the ring segment 9, and the windin51, being thus deenergized, allows the switc 52 to open. This, however,occurs after the switches 60 and 62 have closed. The motors 2 and-'3 arethus connected at this oint in multiple, the resistance portions 2; and28 are in series with the motor 2 and the resistance portions 29 and 30are in series with the motor 3. As the controller 6 moves to thepositionsz' and j, resistance portions 28 and 29 are firstshortcircuited by the rengagement of the fingers 43 and 44 and the rinsegment 9, which dings 39 and 40 and closes the switches 35 and 36,after which the fingers 45 and 46 are brought into engagement with thering segment 9 and the windin s' 41 and 42 are reenergized to close theswitches 37 and 38 andthus short-circuit the resistance portions 27 and30. When the controller 6 occupies the position 7', which is the fullrunnin position of the equipment, the motors 2 an 3 are connected inmultiple with no resistance in the circuit. In case the motor 2 becomesdisabled or unfit for service, so that it is desirable to operate theremainder of the equipment without it, the selective switch 5 may bemoved to the position 1 after the master controller 6 is moved to theoff position, in which case energy is supplied from the battery 4,through finger 63, ring segment 64, and finger 65, lo a magnet winding66, the other terminal. of which is connected to the negative conductor14 and is energized to close the solenoid switch 67. Furthermore,thelingers 18, 22*, 50 and 58 are disengaged from the ring segments 17, 22,49 and 57, respectively, when the selective switch 5 moves to theposition 3/, so that it is impossible to energize the windings 19, 24,51 and 59 by means 01' the controller 6. As the controller 6 is moved tothe position (1, energy is supplied the same as before to close theswitch 15, which allows energy to be supplied from the conductor 1,through the switch 15, the resistal'ice 26, the switch 67, resistanceportions 2'.) and 30, to the motor 3, the other terminal of which isconnected to the opposite line conductor 31. As the controller 6 ismoved successively to the positions 5, 0, cl, 0 and f, resistanceportions 28, 29, 27 and 30 are short-ciicuited, as hereinbeforeexplained, and thus the single motor 3 is connected directly across theline when the controller 6 occupies position f, which is the fullrunning position for the single motor.

Should the motor 3 be disabled While the motor 2 still remainsoperative, the selective switch 5 may be moved to the position a, thecontroller 6 being first moved to the ofi' position, in which case,energy is supplied from the battery 4, throu h the finger 63, ringsegments 68 and 69, li nger 70, and the windin 61, which is thusenergized and closes t e switch 62. Furthermore, when the switch?)occupies the position a, the fingers 23, 50 and 58 are disengaged fromthe ring segmentsl'l', 22, 49 and 57, so that the switches 25, 52 and 60may not be closed. The fingers 16 and 18, however, engage a segment 71which corresponds'to the ring segment 17 and permits theswitch 20 to beclosed, the same as when both motors are in operation.

In this case, when the controller 6 occupies the position a, a; circuitis completed through fingers 10 and 11 to close the switches 15 and 20,and energy is supplied from the main line conductor 1, through switch15, resistance 26, switch 20, to the motor 2, the other terminal ofwhich is connected through the resistance portions 27 and 28 and theswitch '62 to the opposite line conductor 31. As the controller is thenmoved successively to the positions I), c, d, e and f, resistanceportions 26, 27 and 28 are short-circuited, leaving the motor 2 directlyacross the line when the controller 6 is in position 1, which is thefull running position of the motor 2.

' When the selective switch 5 occupies the position w. the mastercontroller 6 may be operated without supplying energy to either motor ofthe equipment. This arrangement permits the op ration of a train,equipped for multiple control, from a car on which none of the motorsare operative.

I claim as my invention:

l. The combination with a plurality of electric motors and an auxiliarycontrol-systent which is governed by a master controller to regulate theconnections thereof and "the amount of resistance inserted in thecircuit therewith, of means for so modifying said auxiliary controlsvstem that one of said motors may be excluded from said circuit 7tierinined resistance,

and the other motor b properly controlled by normal operation of thesaid master controller. said means comprising a selective controllingswitch which may occupy any one of a plurality of positions.

2. The combination with two electric motors and an auxiliary controlsystem which is governed by a nnrstencontroller to successively connectboth motors in series with a predetermined resistance, graduallydecrease said. resistance. connect said motors in parallel with apredetermined resistance a series with each motor and gradually andsiit'iultanmusly decrease said resistance. of l means for so modifyingsaid control system that the normal operation of said master lcontroller may successively connect one of said motors in circuit with apredetermined resistance and gradually decrease said rea mstance. thatcomprises a selective controlling switch having a plluality of posttions. one of said positions providing for normal operation of bothmotors. a second providing for proper operation of only one of themotors, a third providing for operal tion of only the olhcr motor and afourth preventing the operation of either motor.

The combination with a. vehicle equipincnt comprisiuc a rontrol systemgoverned l switches for adjusting tors from the circuit by a mastercontroller, two electric motors and resistances therefor, of a selectivecontrolling switch having a plurality of positions by which said controlsystem may be so modified as to insure either successive connection ofboth motors in series with a predea gradual decrease of said resistance.parallel COIHlectiOll of said motors with a predetermined resistance inseries with each motor. a gradual and simultaneous decrease of saidresistances, or a connectiouof either one of said motors in circuit.with a predetermined resistance and a gradual decrease of saidresistance, while the other motor is open-circuited, when the mastercontroller successively occupies a series of positions.

4. In an electric vehicle, the combination with a plurality of electricdriving motors and a plurality of independently actuated the circuitsthereof, of means for prey-exiting operation of certain of the switchesof the motors from the circuit without interfering with the adjustmentof the circuits of the remaining motors.

5. In an electric vehicle. the combination with a. plurality of electricdriving motors, and independently actuated switches for ad justing thecircuits thereof, of means for preventing operation of certain of theswitches to exclude one or more of the mowithout interfering:

with the adjustment of the circuits of the remaining motors, said meanscomprising a selective controllin switch that may occupy any one of aplurality of positions.

in testimony whereof, I have hereunto subscribed my name this 8th day ofApril.

WILLIAM COOIE t. itnesses ()sv Smononon, Bmunv Hines.

to exclude one or more

